Opening Snap and Second Heart Sound Reference Guide.
Opening Snap and Second Heart SoundAn opening snap occurring early in diastole along with a single second heart sound can mimic a split second heart sound. An opening snap is caused by thickened valve leaflets. When they open it produces a snapping sound. The more severe the thickening the earlier in diastole the opening snap occurs. In this example you are hearing an opening snap which occurs 75 milliseconds after the start of the second heart sound.
Auscultation Sound From Lesson
Patient Recording - Half Speed Playback
The patient's position should be supine.
Diastole: Snap early in diastole, higher pitch than S2
Opening Snap and Second Heart Sound - Reference Page